<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 栅格布局 -->
      <el-row>
        <!-- 添加角色按钮 -->
        <el-col>
          <el-button type="primary" @click="addRoleDialogVisible = true"
            >添加角色</el-button
          >
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template v-slot="scope">
            <!-- 栅格布局 -->
            <!-- 每次for循环都要绑定唯一的key值 -->
            <!-- 一级权限的样式，运用三元运算符的方式进行按需绑定 -->i
            <!-- item1是项，i1是索引 -->
            <!-- closable:给tag标签添加删除的小图标 -->
            <el-row
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 ，span="5"为占栅格布局24份中的5份-->
              <el-col :span="5">
                <el-tag
                  closable
                  @close="removeRightById(scope.row, item1.id)"
                  >{{ item1.authName }}</el-tag
                >
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 二级和三级，加起来总共为后面的24份中的19份 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套 渲染二级权限 -->
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <!-- 渲染二级权限 ，s二级权限占栅格布局的6份-->
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                      >{{ item2.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 渲染三级权限，三级权限占栅格布局的18份 -->
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                      >{{ item3.authName }}</el-tag
                    >
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column label="#" type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template v-slot="scope">
            <el-button
              type="primary"
              icon="el-icon-edit"
              size="mini"
              @click="showEditDialog(scope.row.id)"
              >编辑</el-button
            >
            <el-button
              type="danger"
              icon="el-icon-delete"
              size="mini"
              @click="removeRoleById(scope.row.id)"
              >删除</el-button
            >
            <el-button
              type="warning"
              icon="el-icon-setting"
              size="mini"
              @click="showSetRightDialog(scope.row)"
              >分配角色</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 添加角色的对话框 -->
    <el-dialog
      title="添加角色"
      :visible.sync="addRoleDialogVisible"
      width="50%"
      @close="addRoleDialogClosed"
    >
      <el-form
        :model="addRoleForm"
        ref="addRoleFormRef"
        :rules="addRoleFormRules"
        label-width="100px"
      >
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addRoleForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addRoleForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRoles">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑角色的对话框 -->
    <el-dialog
      title="编辑角色"
      :visible.sync="editRoleDialogVisible"
      width="50%"
      @close="editRoleDialogClosed"
    >
      <el-form
        :model="editRoleForm"
        ref="editRoleFormRef"
        :rules="editRoleFormRules"
        label-width="100px"
      >
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editRoleForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editRoleForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoles">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 分配权限的对话框 -->
    <!-- 
    show-checkbox 展示复选框
    node-key 复选框选中的默认属性
    default-expand-all 默认展开所有节点
    default-checked-keys 默认勾选的节点的数组
    -->

    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <el-tree
        :data="rightsList"
        :props="treeProps"
        ref="treeRef"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 分配权限框
      setRightDialogVisible: false,
      // 权限列表
      rightsList: [],
      //  树形控件的属性绑定对象
      treeProps: {
        label: "authName",
        children: "children",
      },
      //   分配权限中默认选中节点ID值
      defKeys: [],
      //   添加用户对话框
      addRoleDialogVisible: false,
      // 添加角色表单
      addRoleForm: {},
      //   添加角色表单验证
      addRoleFormRules: {
        roleName: [
          { required: true, message: "请输入角色名称", trigger: "blur" },
        ],
        roleDesc: [
          { required: true, message: "请输入角色描述", trigger: "blur" },
        ],
      },
      //   编辑角色信息
      editRoleForm: {},
      editRoleDialogVisible: false,
      editRoleFormRules: {
        roleName: [
          { required: true, message: "请输入角色名称", trigger: "blur" },
        ],
        roleDesc: [
          { required: true, message: "请输入角色描述", trigger: "blur" },
        ],
      },
      //   当前即将分配权限的Id
      roleId: 0,
    };
  },
  created() {
    // 获取所有角色列表
    this.getRolesList();
  },
  methods: {
    // 获取所有角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error("获取角色列表失败！");
      this.$message.success("获取角色列表成功");
      this.rolelist = res.data;
    },
    // 编辑角色权限
    async showEditDialog(id) {
      const { data: res } = await this.$http.get("roles/" + id);
      if (res.meta.status !== 200) return this.$message.error("查询角色信息失败！");
      this.editRoleForm = res.data;
      this.editRoleDialogVisible = true;
    },
    editRoles() {
      this.$refs.editRoleFormRef.validate(async (valid) => {
        // console.log(valid)
        // 表单预校验失败
        if (!valid) return;
        const { data: res } = await this.$http.put(
          "roles/" + this.editRoleForm.roleId,
          {
            roleName: this.editRoleForm.roleName,
            roleDesc: this.editRoleForm.roleDesc,
          }
        );
        if (res.meta.status !== 200) {
          this.$message.error("编辑角色信息失败！");
        }
        // 隐藏编辑角色对话框
        this.editRoleDialogVisible = false;
        this.$message.success("编辑角色信息成功！");
        this.getRolesList();
      });
    },
    // 添加角色
    addRoles() {
      this.$refs.addRoleFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post("roles", this.addRoleForm);
        if (res.meta.status !== 201) this.$message.error("添加角色失败！");
        this.$message.success("添加角色成功！");
        this.addRoleDialogVisible = false;
        this.getRolesList();
      });
    },
    // 删除角色
    async removeRoleById(id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该角色, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除");
      }
      const { data: res } = await this.$http.delete("roles/" + id);
      if (res.meta.status !== 200) return this.$message.error("删除角色失败！");
      this.$message.success("删除用户成功！");
      this.getRolesList();
    },
    // 根据ID删除指定的权限
    async removeRightById(role, rightId) {
      // 弹框提示 删除
      const confirmResult = await this.$confirm(
        "此操作将永久删除该权限, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      // 点击确定 返回值为：confirm
      // 点击取消 返回值为： cancel
      // 如果返回值为confirm，则发起删除的数据请求
      if (confirmResult !== "confirm")
        return this.$message.info("已取消权限删除");
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      );
      if (res.meta.status !== 200) return this.$message.error("删除权限失败！");
      // 删除成功后，给角色信息从新赋值
      role.children = res.data;
      //   不建议使用，会导致信息合起来，不合理
      // this.getRolesList()
    },
    // 分配权限
    async showSetRightDialog(role) {
      this.roleId = role.id;
      // 获取角色的所有权限
      const { data: res } = await this.$http.get("rights/tree");
      if (res.meta.status !== 200) return this.$message.error("获取权限数据失败！")
      //   获取权限树
      this.rightsList = res.data;
      //   console.log(res)
      //   打开对话框前递归获取三级节点的id
      this.getLeafkeys(role, this.defKeys);

      this.setRightDialogVisible = true;
    },
    // 通过递归 获取角色下三级权限的 id, 并保存到defKeys数组
    getLeafkeys(node, arr) {
      // 如果node不包含children属性，则是三级节点
      if (!node.children) return arr.push(node.id)
      // 如果node中包含了children，则利用forEach循环所有数组，再次调用该函数找到三级节点（递归）
      node.children.forEach((item) => this.getLeafkeys(item, arr));
    },
    // 监听权限对话框关闭事件
    setRightDialogClosed() {
      this.defKeys = [];
    },
    // 监听添加用户对话框的关闭事件
    addRoleDialogClosed() {
      this.$refs.addRoleFormRef.resetFields();
    },
    // 监听编辑用户对话框的关闭事件

    editRoleDialogClosed() {
      this.$refs.editRoleFormRef.resetFields();
    },
     // 分配权限的点击事件
    async allotRights (roleId) {
      // 获得当前选中和半选中的Id
      // getCheckedKeys 获取选中的节点的id值
      // getHalfCheckedKeys 获取半选中的节点的id值
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // join() 方法用于把数组中的所有元素放入一个字符串
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) return this.$message.error('权限分配失败！')
      this.$message.success('权限分配成功!')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  },
};
</script>

<style lang="less" scope>
// 一级权限之间的间隔
.el-tag {
  margin: 7px;
}
// 顶部边框线
.bdtop {
  border-top: 1px solid #eee;
}
// 底部边框线
.bdbottom {
  border-bottom: 1px solid #eee;
}
// 格子中的文字样式
.vcenter {
  display: flex;
  align-items: center;
}
</style>